Direct Shear Strength on the São Francisco River Bank, Northeastern Brazil, With or Without Roots of Different Native Species

Several plant species have been studied as reinforcement elements against landslides at slopes, either to protect the splash effect offered by shoots or anchoring soil root system. The objective of this work was investigate influence roots from shrub over mechanical attributes such cohesion and angle internal friction São Francisco riverbank, northeastern Brazil. A trench excavated under treetop every shrubby individual, sampling blocks 0-0.25, 0.25-0.50, 0.50-0.75, 0.75-1.00 m depths. moisture contents, particle size, liquidity limits, plasticity actual specific mass samples were determined. physical initial final weight, void content, degree saturation, shear resistance peaks, cohesion, identified through direct, elementary, consolidated, undrained tests. In with Solanum paniculatum, Mimosa pigra species, highest values for registered roots. Sesbania virgata presented greatest variation in among without position status influenced results direct